如何在Objective-C中创建委托？

@protocol MyDelegateProtocol <NSObject>
- (void)myDelegateMethod:(id)sender;
@end

@interface MyDelegateObject : NSObject
@property (nonatomic, weak) id<MyDelegateProtocol> delegate;
@end

if ([self.delegate respondsToSelector:@selector(myDelegateMethod:)]) {
    [self.delegate myDelegateMethod:self];
}

@interface MyClass : NSObject <MyDelegateProtocol>
@end

@implementation MyClass
- (void)myDelegateMethod:(id)sender {
    // 在这里实现委托方法的逻辑
}
@end

MyDelegateObject *delegateObject = [[MyDelegateObject alloc] init];
delegateObject.delegate = self;